Sealy Ortho Plus Silver Memory Super King Mattress
The Sealy Ortho Plus Silver Memory Mattress pairs a memory foam comfort layer with Sealy's PostureTech CS spring system, which means you get body-shaping pressure relief on top with responsive support underneath.
- Memory foam eases pressure points
- Support that follows how you move
- Firmer edges for sitting & dressing
£629
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Sealy Ortho Plus Silver Memory Mattress
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Mattress details
Mattress
Sealy Ortho Plus Silver Memory Mattress
Size
Firmness
Medium Firm
Construction
Memory Foam
Depth (cm)
25
Layers
2
Layer Details
MemorySense Foam PowerPack
A comfort layer that adapts to the shape of your body, cocooning you in soft foam. It relieves pressure on the parts of your body that bear the majority of your weight, typically hips and shoulders.
PostureTech CS Spring System with EdgeGuard
Sealy's adaptive spring system responds to subtle shifts in body weight and pressure, giving localised support rather than a uniform push-back. High-density EdgeGuard foam strips wrapped around the inside of the springs firm up the edges of the bed.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- Real distance from a restless partner: With 90cm each for two people sharing, the movement-absorbing MemorySense foam gets a helping hand from sheer space between you.
- Room for night-time visitors: Children or a large dog can join you without anyone ending up clinging to the edge, which is where this size beats a UK king for families.
- Usable space right to the sides: EdgeGuard foam strips firm up the perimeter, so the outer stretch of that 180cm width holds you rather than sagging away.
- Support that stays where you are: The PostureTech CS springs respond locally to each sleeper, which means one person shifting on a surface this wide barely registers on the other side.
- Pressure relief at a medium firm feel: The memory foam comfort layer cushions hips and shoulders while the springs keep you supported, a combination that suits most back and combination sleepers sharing this size.
This size suits you if...
You share the bed every night and want the most sleeping space a standard UK size offers, your children or pets treat your bed as their own and you'd rather plan for that than fight it, or your bedroom is large enough that a smaller mattress would look lost. Allow at least 3m x 2.9m of floor space, with more feeling comfortable.
Consider another size if...
Your room falls short of the 3m x 2.9m we suggest, or your staircase has tight turns, since this mattress is delivered flat. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs around 2.7m x 2.9m.
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FAQ's
What size room do I need for the Sealy Ortho Plus Silver super king?
We suggest at least 3m x 2.9m, and that's our guidance rather than Sealy's. That allows you to walk around both sides and open drawers without squeezing past. In a loft conversion, check the ceiling slope too: at 180cm wide, this mattress may only fit against one wall while leaving headroom to sit up.
Is the super king Sealy Ortho Plus Silver worth it over the UK king?
If someone else regularly ends up in your bed, yes. The UK super king is 30cm wider than the UK king and the same length, and that extra width is what keeps two adults comfortable when a child or dog arrives at 3am. If it's strictly two of you and neither is restless, the UK king may be plenty.
How much space do two people get on a super king mattress like this?
90cm each for two people sharing, which is the width of a whole UK single per person. Combined with the MemorySense foam layer, which cushions each sleeper individually, and springs that respond locally rather than tilting the whole surface, a partner turning over is unusually easy to ignore at this size.
Can I get the Sealy Ortho Plus Silver super king into my bedroom?
This is the question to answer before you order. The mattress is delivered flat rather than rolled and boxed, and at 180 x 200cm a flat super king is genuinely awkward on narrow stairs or tight landings. Measure door swings, stairwell turns and the landing itself; if any look marginal, the UK king is a safer bet.
Is the super king a good choice for sharing with children or pets?
It's one of the better reasons to size up. The 6ft width absorbs a night-time visitor without pushing either adult to the edge, and the EdgeGuard foam around the spring unit means the sides stay supportive when someone inevitably ends up sleeping on them. A large dog at the foot still leaves the full 200cm length workable.